M
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Last name: MONNOM
First name: Gérard
International audience
L'évolution des recherches en optique guidée depuis la naissance de cette spécialité a toujours été intimement liée aux progrès effectués sur les matériaux. Au début, il s'est agit d'obtenir des matériaux les plus purs possibles afin d'éviter les phénomènes néfastes d'absorption et de diffusion de l'onde lumineuse dans le milieu. En 1969,...
International audience
In this presentation we would discuss design and fabrication issues with regard to dispersion tailoring of optical fibers for specialty applications. Various design tools, which could be exploited for such purpose, would be discussed.
We report precise quantification of the percentage of ion clusters in Er:ZBLAN fibers by measurement of nonsaturable optical absorption and fitting of these data to a simple theoretical model that includes the role of clustering. In particular, using this indirect measurement technique, we demonstrate that 51% of the ions are present in...
We present some of our research activities dedicated to doped silica-based optical fibers, aiming at understanding the spectral properties of luminescent ions, such as rare-earth and transition metal elements. The influence of the local environment on dopants is extensively studied: energy transfer mechanisms between rare-earth ions, control of...
International audience
International audience
Chirped cladding is proposed as a novel tailoring tool to simultaneously attain wider transmission window and reduced temporal dispersion in an all-solid Bragg-like microstructured optical fiber as compared to its perfectly periodic cladding counterpart. This design route for photonic bandgap microstructured fibers could be exploited as an...
International audience
International audience
We present here a detailed theoretical analysis for realising an inherently gain flattened L+ band Thulium doped fiber amplifier (TDFA), based on a depressed inner-clad (W-fiber) design, wherein the inherent gain flattening is achieved by an optimised bend induced leakage loss. The leakage loss characteristics of W-fiber have been used to...
International audience
A large mode area single-mode optical fiber based on leaky mode filtering has been prepared by modified chemical vapor deposition (MCVD) technique. The fiber has a leaky cladding, which discriminates the fundamental mode from the higher order ones. A preliminary version has 25-µm core diameter and 0.11 numerical aperture. A Gaussian-like mode...
The role of some glass network modifiers on the quantum efficiency of the near-infrared fluorescence from the 3H4 level of Tm3+ ion in silica-based doped fibres is studied. Modifications of the core composition affect the spectroscopic properties of Tm3+ ion. Adding 17.4 mol% of AlO3/2 to the core glass caused an increase of the 3H4 level...
International audience
International audience
International audience
International audience
International audience
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International audience
International audience
International audience